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Fig. 1. Assessment of retinal degeneration in live flies using the FDPP. Images of w,rdgA1, P[rh1-Rh1EGFP] and w,rdgA1, P[rh1-Rh1EGFP];trp343 viewed on a stereomicroscope and recorded digitally. Rescue of retinal degeneration by trp343 results in a crisp pseudopupil in which the rhabdomeres of photoreceptors R1-R6 can be distinctly seen and counted.